Illuminating-body.



' No. 780,043. PATENTED JAN. 17, 1905.

. M. KORFP.

ILLUMINATING BODY.

APPLIGATION FILED 10110.18. 1903.

2 SHEETS-SHEET 1.

PATENT ED JAN. 17, 1905.

Mu KORFP.

ILLUMINATING BODY.

APPLICATION FILED 1330.18, 1903.

2 SHEETS-*SHEBT 2.

Patented January 17, 1905.

PATENT OFFICE.

MAX KORFF, OF I-IANAU-ON-THE-MAIN, GERMANY.

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SPECIFICATION forming part of Letters Patent No. 780,043, dated January17, 1905.

A li md fil d December 18, 1903. Serial No. 185,734.

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Be it known that I, MAX Koarr, a subject of the German Emperor, residingand having my post-oiiice address at Hanan-on-the-Main, Germany, haveinvented certain new and useful Innin'ovements in Illuminating-Bodies,of which the following is a specification.

This invention relates to an improved globe for lamps, lanterns, and thelike; and it substantially consists of a faceted metal frame into whichare inserted glass prisms, pyramids, cones, or the like, each of saidprisms or pyramids having three or more surfaces and each cone having abase with three or more sides. Devices of this kind are substantiallyknown, but have hitherto had the disadvantage that they were formed bysolid prisms or pyramids, by which a considerable part of the lightgenerated within the illuminating body was absorbed. The said solidbodies also had the disadvantage of adding to the weight and cost ofmanufacture of the article. To remove these disadvantages, I replace thesolid prisms, pyramids, or cones by hollow bodies adapted to beseparately inserted into the metal frame. By this means the lightgenerated is allowed to pass freely through the illuminatingbody, andthe weight and cost of the latter are considerably reduced.

To obtain by means of the globes equallyefficient distribution of lightand agreeable illuminating effects as with the known illu minatingbodies of the kind, the hollow prisms, pyramids, or cones are providedwith faceted, step-shared,fluted,0r similar grooves; but if the objectdesired is not so much the distribution of light and an agreeable effectas an eflicient utilization of the light generated the prisms, pyramids,or cones are made wholly or in part smooth.

In the annexed drawings, Figure 1 represents one form of theilluminating-body, according to the present invention, partly in sectionand elevation. Fig. 2 is a section of a hollow body having its endpointed instead of truncated, as shown in Fig. 1; and Fig. 3 is a viewshowing hollow bodies in side elevation, so that the arrangement of themirrors or reflecting-surfaces upon the outside of these bodies may beseen.

The hollow glass prisms (r are separately inserted into a faceted metalframe 6, and their inner surfaces 0/ are provided, for the purpose ofproducing ellicient distribution and agreeable effects, with grooves U,shaped as mentioned above and arranged perpendicularly to the base-linesand extending toward the points. These grooves 0 can, however, be madein the outer surfaces, and they can be made to converge toward theapiees of the respective pyramids, or they can be parallel to thebase-lines thereof. The inner and outer surfaces of the pyramids can beground, and the grooves in the outer surfaces can also be ground toimprove the effect.

Pyramids, prisms, or cones with wholly or partly smooth surfaces can beprovided with mirrors or reflecting-surfaces f on the outsides of thesurfaces themselves. The pyra mids can be pointed or truncated. In thelatter case an aperture 03 can be made in the truncated end, which maybe closed by a lens, glass plate, short rod, or the like. The object ofthis arrangement is to allow rays to be directly emitted as Well asdeflected and dif fused. Colored or uncolored dull or transparent glasscan be used for the pyramids and prisms, and the lenses, glass plates,or the like inserted into truncated pyramids or prisms can also be ofcolored or uncolored glass, and the prisms or pyramids can be of coloredglass and the plates or thelike of un colored glass, or vice versa.

1 claim 1. In an illuminating-body, the eombination with a faceted metalframe, of hollow faceted glass bodies inserted into said frame, the saidbodies being bounded by surfaces making angles with each other,substantially as and for the purpose set forth.

2. In an illuminating-body, the combination with a faceted metal frame,of hollow faceted glass bodies inserted into said frame, the said bodiesbeing bounded by smooth plane surfaces making angles with each other,substantially as described.

8. In an illuminating-body, the combinamaking angles with each other andtruncatedat their outer ends as and for the purpose set forth.

In testimony whereof I have signed my name I 5 to this specification inthe presence of two subscribing witnesses.

MAX KORFF.

Witnesses FRANZ HASSLAOHER, ERWIN DIPPEL.

